The 7 train is now ranked as both the best and worst subway line in the system by widely differing studies.

A report released Thursday by the Straphangers Campaign lauded the 7 line for its frequency of service, subway car cleanliness, relative lack of delays for mechanical breakdowns, and seat availability. The trains comes every 2½ minutes during rush hour.

But just last week, the Citizens Budget Commission ranked the line dead last in the system, stating that 37 percent of the line’s stations were not in a “state of good repair,” with elements such as stair steps, platform edges, and ventilation systems in sketchy condition. That’s 11 percent more problems than the next-worst-performing line, the C.

For both reports, the 7 line ran from Times Square to Flushing, Queens — and they did not factor in the new 34th Street-Hudson Yards station.

Straphangers says that its study includes factors that are more important to subway riders, including short waits, trains that arrive regularly, a chance for a seat, a clean car, and understandable announcements.

But either way, the reports all serve the same purpose, said campaign attorney Gene Russianoff.

“What we hope it does is help communities to fight for better service across the system,” he said.

In general, riders who frequent the 1, 6, 7, E, J/Z, and L lines will have a much more pleasant experience than riders who take the 5, B, C, M, or R trains, according to the Straphangers’ annual “State of the Subways” report card. The 5 and the B lines have been ranked the worst three times in the Straphangers study since 1997.

“Disparities abound. Some lines stink; others just need work.” said Russianoff. “The 5 and the B have been ‘bottom feeders’ for most of their modern careers.”

Across the board, service got worse, according to the Straphangers Report. The car breakdown rate shot up by 7.9 percent, and that was following an 11 percent increase the previous year. The amount of accurate and understandable announcements in cars also declined slightly from 92 percent to 91 percent.